Abstract
The temperature dependences of the electrical resistivity of (Sn1−z Pbz)1−x InxTe alloys with different concentrations of lead (z=0–0.60) and indium (x=0.03–0.20) were studied at temperatures T=0.4–4.2 K in magnetic fields from zero to H=15 kOe. A resistivity drop of no less than three-four orders of magnitude was observed in this range of alloy compositions. Application of a magnetic field above a critical level resulted in a recovery of the sample resistivity to the original value. The observed resistivity drop is identified with a superconducting transition. The critical parameters of the superconducting transition (T c and H c2) were determined at the drop to one half the normal resistivity level. Experimental dependences of the critical supercon-ducting-transition temperature T c and of the second critical magnetic field H c2 on the contents of lead (z) and indium (x) were measured. The data obtained confirm a strong localization of the In impurity states and are evidence of the extrinsic nature of superconductivity in the class of materials under study. It was established that as the Pb content in (Sn1−z Pbz)1−x InxTe increases, T c and H c2 decrease as the Fermi level E F (fixed in the In impurity resonance band) leaves the Δ extremum and the superconductivity breaks down when E F leaves the LΣ saddle point in the valence-band energy spectrum.
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Translated from Fizika Tverdogo Tela, Vol. 43, No. 10, 2001, pp. 1772–1775.
Original Russian Text Copyright © 2001 by Parfen’ev, Shamshur, Nemov.
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Parfen’ev, R.V., Shamshur, D.V. & Nemov, S.A. Superconductivity of (Sn1−z Pbz)1−x InxTe alloys. Phys. Solid State 43, 1845–1849 (2001). https://doi.org/10.1134/1.1410620
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DOI: https://doi.org/10.1134/1.1410620